underhung vs underslung

underhung and underslung both are adjectives.

Word	Noun	Adjective	Verb	Adverb
underhung	No	Yes	No	No
underslung	No	Yes	No	No

As adjectives, underhung and underslung are synonyms defined as:

underhung and underslung: having a lower part projecting beyond the upper

Other synonyms of underhung include undershot.

underhung (adjective)	underslung (adjective)
having a lower part projecting beyond the upper	having a low center of gravity; built low to the ground
supported from below especially resting on a track instead of suspended from above	having a lower part projecting beyond the upper
	supported from above especially in a vehicle having springs attached to the axle from below