shield vs nipple shield

shield and nipple shield both are nouns.

Word	Noun	Adjective	Verb	Adverb
shield	Yes	No	Yes	No
nipple shield	Yes	No	No	No

As nouns, nipple shield is a hyponym of shield; that is, nipple shield is a word with a more specific, narrower meaning than shield:

shield: a protective covering or structure
nipple shield: a rubber or plastic shield to protect the nipples of nursing women

Other hyponyms of shield include plate, scale, shell, shielding, shielding.

shield (noun)	nipple shield (noun)
hard outer covering or case of certain organisms such as arthropods and turtles	a rubber or plastic shield to protect the nipples of nursing women
armor carried on the arm to intercept blows
a protective covering or structure

shield (verb)	nipple shield (verb)
protect, hide, or conceal from danger or harm
hold back a thought or feeling about