tear sac vs dacryocyst

tear sac and dacryocyst both are nouns.

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

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

tear sac and dacryocyst: 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 tear sac include lacrimal sac.

tear sac (noun)	dacryocyst (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