lacrimal sac vs tear sac

lacrimal sac and tear sac both are nouns.

Word	Noun	Adjective	Verb	Adverb
lacrimal sac	Yes	No	No	No
tear sac	Yes	No	No	No

As nouns, lacrimal sac and tear sac are synonyms defined as:

lacrimal sac and tear sac: either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands

Other synonyms of lacrimal sac include dacryocyst.

lacrimal sac (noun)	tear sac (noun)
either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands	either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands