tepal vs plant part

tepal and plant part both are nouns.

Word	Noun	Adjective	Verb	Adverb
tepal	Yes	No	No	No
plant part	Yes	No	No	No

As nouns, plant part is a hypernym of tepal; that is, plant part is a word with a broader meaning than tepal:

tepal: an undifferentiated part of a perianth that cannot be distinguished as a sepal or a petal (as in lilies and tulips)
plant part: any part of a plant or fungus

Other hypernyms of tepal include plant structure.

tepal (noun)	plant part (noun)
an undifferentiated part of a perianth that cannot be distinguished as a sepal or a petal (as in lilies and tulips)	any part of a plant or fungus