tabard vs tunic

tabard and tunic both are nouns.

Word	Noun	Adjective	Verb	Adverb
tabard	Yes	No	No	No
tunic	Yes	No	No	No

As nouns, tunic is a hypernym of tabard; that is, tunic is a word with a broader meaning than tabard:

tabard: a short sleeveless outer tunic emblazoned with a coat of arms; worn by a knight over his armor or by a herald
tunic: any of a variety of loose fitting cloaks extending to the hips or knees

tabard (noun)	tunic (noun)
a short sleeveless outer tunic emblazoned with a coat of arms; worn by a knight over his armor or by a herald	any of a variety of loose fitting cloaks extending to the hips or knees
	an enveloping or covering membrane or layer of body tissue