The word 'infectiously' is the adverb form of the adjective 'infectious'.
The word 'infectious' is the adjective form of the verb to infect.
The noun form of the adjective 'infectious' is infectiousness.
The noun forms of the verb to infect are infection and the gerund, infecting.
The noun infection has the adjective form infectious (which can also simply mean tending to spread, as in infectious laughter). The adverb form is infectiously.
It can be, when it means either "infectious" or "catchy" (infectiously popular).The word catching is the present participle of the verb "to catch." It can be a verb form, an adjective, or a noun (gerund).
She giggled infectiously. We all joined in.
The joke wasn't really funny, but she laughed infectiously and we all found ourselves grinning and chuckling.
The noun form for the adjective horrible is horribleness.
The noun form of the adjective 'prosperous' is prosperousness.A related noun form is prosperity.
The noun form of the adjective obedient is obedience.
noun form of religious
The noun form is punisher
Implication is the noun form of "imply."
The noun form for the adjective austere is austereness. Another noun form is austerity.
The noun form for the adjective glaring is glaringness. Another noun form is glare.