hypodermic needle vs needle

hypodermic needle and needle both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypodermic needle	Yes	No	No	No
needle	Yes	No	Yes	No

As nouns, needle is a hypernym of hypodermic needle; that is, needle is a word with a broader meaning than hypodermic needle:

hypodermic needle (noun)	needle (noun)
a hollow needle	a sharp pointed implement (usually steel)
	a slender pointer for indicating the reading on the scale of a measuring instrument
	a stylus that formerly made sound by following a groove in a phonograph record
	the leaf of a conifer

hypodermic needle (verb)	needle (verb)
	annoy or provoke, as by constant criticism
	prick with a needle