concomitant vs occurrent

concomitant and occurrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
concomitant	Yes	Yes	No	No
occurrent	Yes	Yes	No	No

As nouns, occurrent is a hypernym of concomitant; that is, occurrent is a word with a broader meaning than concomitant:

concomitant: an event or situation that happens at the same time as or in connection with another
occurrent: an event that happens

Other hypernyms of concomitant include happening, natural event, occurrence.

concomitant (noun)	occurrent (noun)
an event or situation that happens at the same time as or in connection with another	an event that happens

concomitant (adjective)	occurrent (adjective)
occurring with or following as a consequence	presently occurring (either causally or incidentally)