free—freedom kind—kindness ill—illness sick—sickness
draw—drawing read—reading paint—painting train—training
warn—warning spell—spelling music—musician rich—richness
sad—sadness careless—carelessness careful—carefulness
dificult—difficulty high—height safe—safety warm—warmth
long—length strong—strength violin—violist/violinist
write—writing science—scientist piano—pianist ugly—ugliness
happy—happiness unhappy—unhappiness diferent—diference
patient—patience confident—confidence able—ability
convenient—convenience excellent—excellence silent—silence
wise—wisdom deep—depth wide—width true—truth young—youth
