sash fastener vs sash lock

sash fastener and sash lock both are nouns.

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

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

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

Other synonyms of sash fastener include window lock.

sash fastener (noun)	sash lock (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