writing paper vs ola

writing paper and ola both are nouns.

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

As nouns, ola is a hyponym of writing paper; that is, ola 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
ola: leaf or strip from a leaf of the talipot palm used in India for writing paper

writing paper (noun)	ola (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