pipe up vs shrill

pipe up is not an adjective while shrill is an adjective.

Word	Noun	Adjective	Verb	Adverb
pipe up	No	No	Yes	No
shrill	No	Yes	Yes	No

As verbs, pipe up and shrill are synonyms defined as:

Other synonyms of pipe up include pipe, shriek.

pipe up (adjective)	shrill (adjective)
	of colors that are bright and gaudy
	having or emitting a high-pitched and sharp tone or tones
	being sharply insistent on being heard

pipe up (verb)	shrill (verb)
begin to play or sing	utter a shrill cry
utter a shrill cry