peep vs speak

peep is a noun but speak is not a noun.

Word	Noun	Adjective	Verb	Adverb
peep	Yes	No	Yes	No
speak	No	No	Yes	No

As verbs, speak is a hypernym of peep; that is, speak is a word with a broader meaning than peep:

Other hypernyms of peep include mouth, talk, utter, verbalise, verbalize.

peep (noun)	speak (noun)
a secret look
the short weak cry of a young bird

peep (verb)	speak (verb)
appear as though from hiding	express in speech
make high-pitched sounds	exchange thoughts; talk with
speak in a hesitant and high-pitched tone of voice	use language
look furtively	give a speech to
cause to come into view	make a characteristic or natural sound