Return the number of words in a string

## Examples

```
syn_end <- syn("end")
syn_end_words <- n_words(syn_end)
syn_end[syn_end_words <= 1]
#> [1] "abandon" "abort" "accomplishment" "acme"
#> [5] "afterglow" "afterimage" "aim" "all"
#> [9] "allotment" "allowance" "annihilate" "annihilation"
#> [13] "answer" "apogee" "archer" "arrest"
#> [17] "astrology" "athlete" "attend" "balance"
#> [21] "ballplayer" "bane" "baseballer" "baseman"
#> [25] "batter" "battery" "belay" "bell"
#> [29] "bit" "bite" "borderline" "bound"
#> [33] "boundary" "bourn" "bowman" "budget"
#> [37] "butt" "by-end" "by-purpose" "cancel"
#> [41] "cap" "catastrophe" "catcher" "cease"
#> [45] "ceiling" "center" "cessation" "chaff"
#> [49] "check" "checkmate" "chip" "chloroform"
#> [53] "chunk" "circumscription" "climax" "clip"
#> [57] "clipping" "close" "closing" "closure"
#> [61] "coach" "coda" "collop" "commission"
#> [65] "compass" "competitor" "complete" "completing"
#> [69] "completion" "conclude" "conclusion" "confine"
#> [73] "confines" "constellation" "consummation" "contingent"
#> [77] "cracking" "cricketer" "crown" "crumb"
#> [81] "culminate" "culmination" "cup" "curtains"
#> [85] "cut" "cutoff" "cutting" "deadline"
#> [89] "deadlock" "deal" "death" "deathblow"
#> [93] "debris" "decease" "decipherment" "decoding"
#> [97] "delimitation" "demise" "denouement" "departure"
#> [101] "desist" "desistance" "destination" "destiny"
#> [105] "destroy" "desuetude" "determinant" "determination"
#> [109] "determine" "detritus" "develop" "die"
#> [113] "disappear" "discontinuance" "discontinuation" "discontinue"
#> [117] "disentanglement" "dispatch" "dissolution" "dividend"
#> [121] "dole" "dollop" "doom" "dying"
#> [125] "end" "endgame" "ending" "ensue"
#> [129] "eventuate" "execute" "exit" "expiration"
#> [133] "expire" "explanation" "exterminate" "extinction"
#> [137] "extinguishment" "extreme" "extremity" "fare"
#> [141] "fatality" "fate" "filings" "finale"
#> [145] "finality" "finalize" "finding" "finding-out"
#> [149] "finis" "finish" "finishing" "floor"
#> [153] "follow" "footballer" "foredoom" "fortune"
#> [157] "fossil" "fragment" "Friday" "frontier"
#> [161] "future" "game" "games-player" "gamester"
#> [165] "go" "goal" "gob" "gobbet"
#> [169] "going" "grave" "guard" "gun"
#> [173] "half" "halt" "halver" "hedge"
#> [177] "helping" "hold" "holdover" "hunk"
#> [181] "husks" "immolate" "inevitability" "infielder"
#> [185] "interest" "interface" "interpretation" "issue"
#> [189] "jock" "jumper" "kill" "kismet"
#> [193] "knell" "leaving" "leavings" "leftovers"
#> [197] "limen" "limit" "limitation" "line"
#> [201] "lineman" "liquidate" "lockout" "lot"
#> [205] "lump" "lynch" "march" "mark"
#> [209] "martyr" "martyrize" "maturation" "maturity"
#> [213] "maximum" "measure" "meed" "mess"
#> [217] "mete" "modicum" "moiety" "moira"
#> [221] "morsel" "nip" "object" "objective"
#> [225] "offscourings" "orts" "outcome" "outfield"
#> [229] "outfielder" "paring" "parings" "part"
#> [233] "particle" "parting" "pass" "passing"
#> [237] "payoff" "peak" "percentage" "perfect"
#> [241] "perfection" "period" "perish" "perishing"
#> [245] "perorate" "piece" "pinnacle" "planets"
#> [249] "player" "poison" "poloist" "portion"
#> [253] "prey" "proportion" "prove" "pugilist"
#> [257] "purge" "pursuit" "quantum" "quarry"
#> [261] "quarterback" "quietus" "quintain" "quit"
#> [265] "quota" "racer" "rags" "rake-off"
#> [269] "rasher" "ration" "reason" "refrain"
#> [273] "refuse" "release" "relics" "relinquish"
#> [277] "remainder" "remains" "remnant" "renounce"
#> [281] "residue" "residuum" "resolution" "resolve"
#> [285] "resolving" "rest" "result" "reward"
#> [289] "riddling" "ripeness" "roach" "rubbish"
#> [293] "ruins" "rump" "sacrifice" "sawdust"
#> [297] "scoop" "scourings" "scrap" "scraps"
#> [301] "scratch" "scrub" "segment" "shadow"
#> [305] "shard" "share" "shaving" "shavings"
#> [309] "shiver" "shred" "skater" "slaughter"
#> [313] "slay" "sleep" "slice" "sliver"
#> [317] "smithereen" "snack" "snatch" "snip"
#> [321] "snippet" "solution" "solving" "splinter"
#> [325] "sport" "sportsman" "stake" "stalemate"
#> [329] "stand" "standoff" "standstill" "stars"
#> [333] "start" "starve" "stay" "stitch"
#> [337] "stock" "stop" "stoppage" "straw"
#> [341] "strike" "stubble" "stump" "succumb"
#> [345] "summit" "survival" "sweepings" "tackle"
#> [349] "tailback" "target" "tatter" "teleology"
#> [353] "term" "terminal" "terminate" "termination"
#> [357] "terminus" "threshold" "tip" "to"
#> [361] "top" "toxophilite" "trace" "ultimate"
#> [365] "unfold" "unraveling" "unriddling" "unscrambling"
#> [369] "unspinning" "untangling" "untwisting" "unweaving"
#> [373] "upshot" "utmost" "uttermost" "vanish"
#> [377] "vestige" "walkout" "waste" "weird"
#> [381] "windup" "wingback" "working" "working-out"
#> [385] "wrestler"
```