opener vs tin opener

opener and tin opener both are nouns.

Word	Noun	Adjective	Verb	Adverb
opener	Yes	No	No	No
tin opener	Yes	No	No	No

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

Other hyponyms of opener include bottle opener, can opener, latchstring.

opener (noun)	tin opener (noun)
a hand tool used for opening sealed containers (bottles or cans)	a device for cutting cans open
the first event in a series
a person who unfastens or unwraps or opens