dead centre vs spatial relation

dead centre and spatial relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead centre	Yes	No	No	No
spatial relation	Yes	No	No	No

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

dead centre: the position of a crank when it is in line with the connecting rod and not exerting torque
spatial relation: the spatial property of a place where or way in which something is situated

Other hypernyms of dead centre include position.

dead centre (noun)	spatial relation (noun)
the position of a crank when it is in line with the connecting rod and not exerting torque	the spatial property of a place where or way in which something is situated