ticker vs internal organ

ticker and internal organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
ticker	Yes	No	No	No
internal organ	Yes	No	No	No

As nouns, internal organ is a hypernym of ticker; that is, internal organ is a word with a broader meaning than ticker:

ticker: the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body
internal organ: a main organ that is situated inside the body

Other hypernyms of ticker include viscus.

ticker (noun)	internal organ (noun)
a character printer that automatically prints stock quotations on ticker tape	a main organ that is situated inside the body
a small portable timepiece
the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body