pahoehoe vs lava

pahoehoe and lava both are nouns.

Word	Noun	Adjective	Verb	Adverb
pahoehoe	Yes	No	No	No
lava	Yes	No	No	No

As nouns, lava is a hypernym of pahoehoe; that is, lava is a word with a broader meaning than pahoehoe:

pahoehoe: freely flowing lava
lava: rock that in its molten form (as magma) issues from volcanoes; lava is what magma is called when it reaches the surface

pahoehoe (noun)	lava (noun)
freely flowing lava	rock that in its molten form (as magma) issues from volcanoes; lava is what magma is called when it reaches the surface