seedcase vs pea pod

seedcase and pea pod both are nouns.

Word	Noun	Adjective	Verb	Adverb
seedcase	Yes	No	No	No
pea pod	Yes	No	No	No

As nouns, pea pod is a hyponym of seedcase; that is, pea pod is a word with a more specific, narrower meaning than seedcase:

seedcase: the vessel that contains the seeds of a plant (not the seeds themselves)
pea pod: husk of a pea; edible in some garden peas

Other hyponyms of seedcase include peasecod.

seedcase (noun)	pea pod (noun)
the vessel that contains the seeds of a plant (not the seeds themselves)	husk of a pea; edible in some garden peas