shield-shaped vs simple

shield-shaped is not a noun while simple is a noun.

Word	Noun	Adjective	Verb	Adverb
shield-shaped	No	Yes	No	No
simple	Yes	Yes	No	No

shield-shaped (noun)	simple (noun)
	a person lacking intelligence or common sense
	any herbaceous plant having medicinal properties

shield-shaped (adjective)	simple (adjective)
(of a leaf shape) round, with the stem attached near the center of the lower surface rather than the margin (as a nasturtium leaf for example)	(botany) of leaf shapes; of leaves having no divisions or subdivisions
	having few parts; not complex or complicated or involved
	easy and not involved or complicated
	exhibiting childlike simplicity and credulity
	unornamented
	lacking mental capacity and subtlety
	apart from anything else; without additions or modifications