ascocarp vs perithecium

ascocarp and perithecium both are nouns.

Word	Noun	Adjective	Verb	Adverb
ascocarp	Yes	No	No	No
perithecium	Yes	No	No	No

As nouns, perithecium is a hyponym of ascocarp; that is, perithecium is a word with a more specific, narrower meaning than ascocarp:

Other hyponyms of ascocarp include ascoma, apothecium, cleistocarp, cleistothecium.

ascocarp (noun)	perithecium (noun)
mature fruiting body of an ascomycetous fungus	flask-shaped ascocarp