fullback

As a proper noun siberia

is (region of russia).

As a noun fullback is

(american football) an offensive back whose primary jobs are to block in advance of the halfback on running plays and for the quarterback on passing plays.

As nouns the difference between tuvan and fullback

is that tuvan is someone from tuva while fullback is (american football) an offensive back whose primary jobs are to block in advance of the halfback on running plays and for the quarterback on passing plays.

As an adjective tuvan

is of, from, or pertaining to tuva or its people or culture.

As a proper noun tuvan

is a turkic language spoken around the area of tuva.