writing paper vs olla

writing paper and olla both are nouns.

Word	Noun	Adjective	Verb	Adverb
writing paper	Yes	No	No	No
olla	Yes	No	No	No

As nouns, olla is a hyponym of writing paper; that is, olla is a word with a more specific, narrower meaning than writing paper:

writing paper: paper material made into thin sheets that are sized to take ink; used for writing correspondence and manuscripts
olla: leaf or strip from a leaf of the talipot palm used in India for writing paper

writing paper (noun)	olla (noun)
paper material made into thin sheets that are sized to take ink; used for writing correspondence and manuscripts	leaf or strip from a leaf of the talipot palm used in India for writing paper