razor vs straight razor

razor and straight razor both are nouns.

Word	Noun	Adjective	Verb	Adverb
razor	Yes	No	Yes	No
straight razor	Yes	No	No	No

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

razor: edge tool used in shaving
straight razor: a razor with a straight cutting edge enclosed in a case that forms a handle when the razor is opened for use

Other hyponyms of razor include safety razor, electric razor, electric shaver, shaver.

razor (noun)	straight razor (noun)
edge tool used in shaving	a razor with a straight cutting edge enclosed in a case that forms a handle when the razor is opened for use

razor (verb)	straight razor (verb)
shave with a razor