acrostic vs word square

acrostic and word square both are nouns.

Word	Noun	Adjective	Verb	Adverb
acrostic	Yes	No	No	No
word square	Yes	No	No	No

As nouns, acrostic and word square are synonyms defined as:

acrostic and word square: a puzzle where you fill a square grid with words reading the same down as across

acrostic (noun)	word square (noun)
a puzzle where you fill a square grid with words reading the same down as across	a puzzle where you fill a square grid with words reading the same down as across
verse in which certain letters such as the first in each line form a word or message