sash fastener vs window lock

sash fastener and window lock both are nouns.

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

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

sash fastener and window 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 sash lock.

sash fastener (noun)	window 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