erratic vs wandering

erratic is not a noun while wandering is a noun.

Word	Noun	Adjective	Verb	Adverb
erratic	No	Yes	No	No
wandering	Yes	Yes	No	No

As adjectives, erratic and wandering are synonyms defined as:

Other synonyms of erratic include planetary.

erratic (noun)	wandering (noun)
	travelling about without any clear destination

erratic (adjective)	wandering (adjective)
liable to sudden unpredictable change	of a path e.g.
likely to perform unpredictably	having no fixed course
having no fixed course	migratory