• Safire, William


• sans-serif


• Sapir, Edward


• Sapir–Whorf hypothesis


• sarcasm


• Saussure, Ferdinand de


• Saxon genitive


• Saxonism


• Scandinavian


• scheme


• Schlegel, Friedrich


• schwa


• Scoticism


• Scots


• Scottish


• Scottism


• Scouse


• scratch comma (/)


• script


• secondary object


• section (§)


• semantics


• semaphore


• semasiology


• sememe


• semicolon (;)


• semiotics


• semiphonotypy


• Semi-Saxon


• sentence


• sentence adverb


• sentence element


• separatrix (|)


• serial comma


• serif


• sesquipedalian


• s-genitive


• shall | will


• shear | sheer


• shibboleth


• shorthand


• short passive


• short vowel


• Siamese twins


• sibilant


• sideroxylon


• sigmatism


• sign


• sign (Saussure)


• signifier


• SIL International Ethnologue


• simile


• Simon, John


• simple adverb


• simple future


• simple past


• simple present


• simple sentence


• simple tense


• simple verb


• singular


• singular "they"


• singulare tantum


• slang


• sniglet


• sociolect


• soft hyphen (-)


• soft palate


• solecism


• solidus (⁄)


• soraismus


• speaking in tongues


• speech


• spelling numbers


• spliced idiom


• split infinitive


• split modifier


• Spooner, William


• spoonerism


• spot-plague


• Sprachraum


• square brackets ([ ])


• squinting modifier


• stationary | stationery


• stative passive


• stative verb


• stem


• stenography


• stress


• strong verb


• Strunk, William Jr.


• StudlyCaps


• stylistics


• subject


• subject complement


• subjective pronoun


• subjunctive mood


• subordinate clause


• subordinate conjunction


• subordinate future


• subordinating conjunction


• subordinating connective


• subordination


• subordinator


• subreption


• substantive


• substantive adjective


• substantive participle


• such as


• suffix


• superlative


• superlative of two


• superordinate


• supine


• suppletion


• suspended compound adjective


• suspended hyphen (-)


• suspension point (…)


• suspension sign


• SVO language


• swung dash (~)


• syllabary


• syllabification


• syllable


• syllable word


• syllepsis


• synaeresis


• synaesthesia (literary)


• synaesthesia (medical)


• synaloepha


• synchysis


• syncopation


• syncope


• syndetic coordination


• synecdoche


• synonym


• synonymia


• synonymy


• synopsis


• syntactic expletive


• syntax


• synthetic language


• systole


• systrophe