Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

substantiate

UK /səbˈstænʃieɪt/ · US /səbˈstænʃiˌeɪt/ verb

Forms substantiates substantiating substantiated

verb (transitive) To verify something by supplying evidence; to authenticate or corroborate. “substantiate allegations”
verb (transitive) To give material form or substance to something; to embody; to record in documents

Synonyms

From Medieval Latin substantiatus (“given substance”), from the verb substantiare, first used 1657.

verb To make to exist; to make real. Ayliffe.
verb To establish the existence or truth of by proof or competent evidence; to verify; as, to substantiate a charge or allegation; to substantiate a declaration.

Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “substantiate”, CC BY-SA 4.0. Details