window lock vs sash fastener

window lock and sash fastener both are nouns.

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

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

window 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 window lock include sash lock.

window 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