opener vs latchstring

opener and latchstring both are nouns.

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

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

opener: a hand tool used for opening sealed containers (bottles or cans)
latchstring: opener consisting of a string that can be passed through a hole in a door for raising the latch from outside

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

opener (noun)	latchstring (noun)
a hand tool used for opening sealed containers (bottles or cans)	opener consisting of a string that can be passed through a hole in a door for raising the latch from outside
the first event in a series
a person who unfastens or unwraps or opens