Few and One

Few adjective - A quantifier that can be used with count nouns and is often preceded by `a'; a small but indefinite number.

One and few are semantically related. in referring to a specifically known amount topic. In some cases you can use "One" instead the word "Few" as an adjective or a pronoun.

One adjective - Being the one or ones of a class with no other members.

Few and one are semantically related. Sometimes you can use "Few" instead the word "One" as an adjective or a pronoun.