unaccompanied

As adjectives the difference between alone and unaccompanied

is that alone is by oneself, solitary while unaccompanied is travelling without companions.

As an adverb alone

is by one's self; apart from, or exclusive of, others; solo.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective unaccompanied is

travelling without companions.

As adjectives the difference between solitary and unaccompanied

is that solitary is living or being by one's self; alone; having no companion present; being without associates while unaccompanied is travelling without companions.

As a noun solitary

is one who lives alone, or in solitude; an anchoret, hermit or recluse.