varix vs varicosity

varix and varicosity both are nouns.

Word	Noun	Adjective	Verb	Adverb
varix	Yes	No	No	No
varicosity	Yes	No	No	No

As nouns, varicosity is a hyponym of varix; that is, varicosity is a word with a more specific, narrower meaning than varix:

varix: abnormally enlarged or twisted blood vessel or lymphatic vessel
varicosity: varix or varicose condition in which a vein is swollen and tortuous

varix (noun)	varicosity (noun)
abnormally enlarged or twisted blood vessel or lymphatic vessel	varix or varicose condition in which a vein is swollen and tortuous