tessellation vs juxtaposition

tessellation and juxtaposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
tessellation	Yes	No	No	No
juxtaposition	Yes	No	No	No

As nouns, juxtaposition is a hypernym of tessellation; that is, juxtaposition is a word with a broader meaning than tessellation:

Other hypernyms of tessellation include apposition, collocation.

tessellation (noun)	juxtaposition (noun)
the act of adorning with mosaic	the act of positioning close together (or side by side)
the careful juxtaposition of shapes in a pattern	a side-by-side position