tinned meat vs Spam

tinned meat and Spam both are nouns.

Word	Noun	Adjective	Verb	Adverb
tinned meat	Yes	No	No	No
Spam	Yes	No	No	No

As nouns, Spam is a hyponym of tinned meat; that is, Spam is a word with a more specific, narrower meaning than tinned meat:

Other hyponyms of tinned meat include Fanny Adams.

tinned meat (noun)	Spam (noun)
meat preserved in a can or tin	a canned meat made largely from pork