tubercle vs nodule

tubercle and nodule both are nouns.

Word	Noun	Adjective	Verb	Adverb
tubercle	Yes	No	No	No
nodule	Yes	No	No	No

As nouns, tubercle and nodule are synonyms defined as:

tubercle (noun)	nodule (noun)
a protuberance on a bone especially for attachment of a muscle or ligament	a small node
small rounded wartlike protuberance on a plant	(mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)
a swelling that is the characteristic lesion of tuberculosis	small rounded wartlike protuberance on a plant