Noun and Adjectives

Ardour        Arduous

Censor        Censorious

Error         Erroneous

Horror        Horrendous

Labour        Laborious

Nectar        Nectoreous

Stridor       Stridulous

Tremor        Tremulous

Tuber         Tuberous

Ulcer         Ulcerous

Uproar        Uproarious

Vicar         Vicarious

Ether         Ethereous