underprivilege

As a verb marginalize

is to relegate (something, especially a topic or a group of people,) to the margins or to a lower limit.

As a noun underprivilege is

a lack of opportunities or advantages enjoyed by others.

As nouns the difference between terms and underprivilege

is that terms is while underprivilege is a lack of opportunities or advantages enjoyed by others.

As nouns the difference between underprivilege and underprivileged

is that underprivilege is a lack of opportunities or advantages enjoyed by others while underprivileged is a deprived person; deprived people.

As an adjective underprivileged is

deprived of the opportunities and advantages of others.