testudo vs protective cover

testudo and protective cover both are nouns.

Word	Noun	Adjective	Verb	Adverb
testudo	Yes	No	No	No
protective cover	Yes	No	No	No

As nouns, protective cover is a hypernym of testudo; that is, protective cover is a word with a broader meaning than testudo:

testudo: a movable protective covering that provided protection from above; used by Roman troops when approaching the walls of a besieged fortification
protective cover: a covering that is intend to protect from damage or injury

Other hypernyms of testudo include protection, protective covering.

testudo (noun)	protective cover (noun)
a movable protective covering that provided protection from above; used by Roman troops when approaching the walls of a besieged fortification	a covering that is intend to protect from damage or injury