tester vs canopy

tester and canopy both are nouns.

Word	Noun	Adjective	Verb	Adverb
tester	Yes	No	No	No
canopy	Yes	No	Yes	No

As nouns, canopy is a hypernym of tester; that is, canopy is a word with a broader meaning than tester:

tester: a flat canopy (especially one over a four-poster bed)
canopy: a covering (usually of cloth) that serves as a roof to shelter an area from the weather

tester (noun)	canopy (noun)
a flat canopy (especially one over a four-poster bed)	a covering (usually of cloth) that serves as a roof to shelter an area from the weather
someone who administers a test to determine your qualifications	the umbrellalike part of a parachute that fills with air
	the transparent covering of an aircraft cockpit

tester (verb)	canopy (verb)
	cover with a canopy