As nouns the difference between subset and subunit

is that subset is (set theory) with respect to another set, a set such that each of its elements is also an element of the other set while subunit is any subdivision of a larger unit.

As nouns the difference between subset and subsequence

is that subset is (set theory) with respect to another set, a set such that each of its elements is also an element of the other set while subsequence is a subsequent act or thing; a sequel or subsequence can be (mathematics) a sequence that is contained within a larger one.

As nouns the difference between subset and sublist

is that subset is (set theory) with respect to another set, a set such that each of its elements is also an element of the other set while sublist is a list that makes up part of a larger list.

As nouns the difference between subset and subcategory

is that subset is (set theory) with respect to another set, a set such that each of its elements is also an element of the other set while subcategory is with respect to a given category, a more narrow category.