FIT - unfit $adj.$, fitting $adj.$

DIFFER - different $adj.$, differently $adv.$

COORDINATE - coordination $n.$, coordinated $adj.$

WEIGHT - weightless $adj.$, weighty $adj.$

ATHLETE - athletic $adj.$, athleticism $n.$

WRESTLING - wrestler $n.$, wrestle $v.$

STRONG - strongly $adv.$, strength $n.$

COMPETE - competition $n.$, competitive $adj.$

DISABLE - disability $n.$, disabled $adj.$

ILL - illness $n.$, illegal $adj.$