externality vs spatial relation

externality and spatial relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
externality	Yes	No	No	No
spatial relation	Yes	No	No	No

As nouns, spatial relation is a hypernym of externality; that is, spatial relation is a word with a broader meaning than externality:

externality: the quality or state of being outside or directed toward or relating to the outside or exterior
spatial relation: the spatial property of a place where or way in which something is situated

Other hypernyms of externality include position.

externality (noun)	spatial relation (noun)
the quality or state of being outside or directed toward or relating to the outside or exterior	the spatial property of a place where or way in which something is situated