IPA: //səbˈstæn.tɪ.vəl//
KK: /səb'stæn.tɪ.vəl/
Relating to or characteristic of a noun or substantive in grammar.
In some languages, substantival forms can function as both nouns and adjectives.
Substantival → It is formed from "substantia" (from Latin, meaning substance or essence) and the suffix "-al" (meaning pertaining to). The word "substantival" refers to something that pertains to or is characteristic of a substance or essence.
Think of 'substance' ('substantia') to remember that 'substantival' means related to the essence or nature of something.