egg cell vs ootid

egg cell and ootid both are nouns.

Word	Noun	Adjective	Verb	Adverb
egg cell	Yes	No	No	No
ootid	Yes	No	No	No

As nouns, ootid is a hyponym of egg cell; that is, ootid is a word with a more specific, narrower meaning than egg cell:

egg cell: the female reproductive cell; the female gamete
ootid: mature ovum after penetration by sperm but before the formation of a zygote

Other hyponyms of egg cell include egg, ovule.

egg cell (noun)	ootid (noun)
the female reproductive cell; the female gamete	mature ovum after penetration by sperm but before the formation of a zygote