optional

As adjectives the difference between selective and optional

is that selective is of or pertaining to the process of selection while optional is not compulsory; left to personal choice; elective.

As a noun taxonomy

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

As an adjective optional is

not compulsory; left to personal choice; elective.

As adjectives the difference between optional and optionable

is that optional is not compulsory; left to personal choice; elective while optionable is of or pertaining to options on a stock or equity. For some stocks, it is possible to trade options on them, hence they are optionable, for other stocks options aren't traded so they are not optionable.

As adjectives the difference between optional and picky

is that optional is not compulsory; left to personal choice; elective while picky is fussy; particular; demanding to have things just right.

As a noun picky is

(informal) a picture.

As an adjective optional

is not compulsory; left to personal choice; elective.

As a noun optician is

a person who makes or dispenses lenses, spectacles.

As adjectives the difference between optional and nonoptional

is that optional is not compulsory; left to personal choice; elective while nonoptional is not optional.