leaf vs betel

leaf and betel both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf	Yes	No	Yes	No
betel	Yes	No	No	No

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

leaf (noun)	betel (noun)
hinged or detachable flat section (as of a table or door)	Asian pepper plant whose leaves are chewed with betel nut (seed of the betel palm) by southeast Asians
a sheet of any written or printed material (especially in a manuscript or book)	a leaf of a vine from the betel pepper
the main organ of photosynthesis and transpiration in higher plants

leaf (verb)	betel (verb)
produce leaves, of plants
turn over pages
look through a book or other written material