bitter betch vs vetch

bitter betch and vetch both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitter betch	Yes	No	No	No
vetch	Yes	No	No	No

As nouns, vetch is a hypernym of bitter betch; that is, vetch is a word with a broader meaning than bitter betch:

bitter betch: European perennial toxic vetch
vetch: any of various climbing plants of the genus Vicia having pinnately compound leaves that terminate in tendrils and small variously colored flowers; includes valuable forage and soil-building plants

bitter betch (noun)	vetch (noun)
European perennial toxic vetch	any of various climbing plants of the genus Vicia having pinnately compound leaves that terminate in tendrils and small variously colored flowers; includes valuable forage and soil-building plants