adjective

1. existing independently; not dependent upon or subordinate to another
2. of considerable amount or quantity; substantial
3. having a real existence; actual
4. 1. of, containing, or dealing with the essential elements; essential
   2. having direct bearing on a matter
5. of or relating to legal rights and principles as distinguished from legal procedures
6. becoming fixed without the use of a mordant: said of a dye
7. Gram.
   1. expressing existence the substantive verb “to be”
   2. of or used as a substantive

Etymology: LME < LL substantivus < L substantia: see substance

noun

1. something substantive
2. Gram. a noun or any other word or group of words that functions as a noun; nominal