alternative

nouns

one of a number of things from which only one can be chosen
"what option did I have?"; "there no other alternative"; "my only choice is to refuse"

adjectives

serving or used in place of another
"an alternative plan"
necessitating a choice between mutually exclusive possibilities
"alternative possibilities were neutrality or war"
is similar to
serving or tending to divide or separate
pertaining to unconventional choices
"an alternative life style"
is similar to
not conventional or conformist
"unconventional life styles"