sash lock vs sash fastener

sash lock and sash fastener both are nouns.

Word	Noun	Adjective	Verb	Adverb
sash lock	Yes	No	No	No
sash fastener	Yes	No	No	No

As nouns, sash lock and sash fastener are synonyms defined as:

sash lock and sash fastener: a lock attached to the sashes of a double hung window that can fix both in the shut position

Other synonyms of sash lock include window lock.

sash lock (noun)	sash fastener (noun)
a lock attached to the sashes of a double hung window that can fix both in the shut position	a lock attached to the sashes of a double hung window that can fix both in the shut position