dacryocyst vs tear sac

dacryocyst and tear sac both are nouns.

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

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

dacryocyst 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 dacryocyst include lacrimal sac.

dacryocyst (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