atilt vs leaning

atilt is not a noun while leaning is a noun.

Word	Noun	Adjective	Verb	Adverb
atilt	No	Yes	No	No
leaning	Yes	Yes	No	No

As adjectives, atilt and leaning are synonyms defined as:

atilt and leaning: departing or being caused to depart from the true vertical or horizontal

Other synonyms of atilt include canted, tilted, tipped.

atilt (noun)	leaning (noun)
	the act of deviating from a vertical position
	the property possessed by a line or surface that departs from the vertical
	a natural inclination
	an inclination to do something

atilt (adjective)	leaning (adjective)
departing or being caused to depart from the true vertical or horizontal	departing or being caused to depart from the true vertical or horizontal