palisade vs slate fence

palisade and slate fence both are nouns.

Word	Noun	Adjective	Verb	Adverb
palisade	Yes	No	Yes	No
slate fence	Yes	No	No	No

As nouns, slate fence is a hyponym of palisade; that is, slate fence is a word with a more specific, narrower meaning than palisade:

palisade: fortification consisting of a strong fence made of stakes driven into the ground
slate fence: a type of palisade made of vertical slabs of slate wired together.

palisade (noun)	slate fence (noun)
fortification consisting of a strong fence made of stakes driven into the ground	a type of palisade made of vertical slabs of slate wired together.

palisade (verb)	slate fence (verb)
surround with a wall in order to fortify