adj.
VERBS
▪ be , seem
▪ become
ADVERB
▪ extremely , fairly , very , etc.
▪ extraordinarily , unusually
▪ relatively
▪ increasingly
Rapid is used with these nouns: ↑ acceleration , ↑ access , ↑ accumulation , ↑ advance , ↑ ascent , ↑ assessment , ↑ breathing , ↑ build-up , ↑ burst , ↑ change , ↑ climb , ↑ completion , ↑ decay , ↑ decline , ↑ decrease , ↑ demise , ↑ depletion , ↑ deployment , ↑ descent , ↑ destruction , ↑ deterioration , ↑ development , ↑ disappearance , ↑ disintegration , ↑ drop , ↑ emergence , ↑ erosion , ↑ escalation , ↑ establishment , ↑ evolution , ↑ exit , ↑ expansion , ↑ fall , ↑ fire , ↑ fluctuation , ↑ footstep , ↑ gain , ↑ growth , ↑ heartbeat , ↑ identification , ↑ improvement , ↑ increase , ↑ influx , ↑ integration , ↑ loss , ↑ motion , ↑ move , ↑ movement , ↑ onset , ↑ pace , ↑ passage , ↑ progress , ↑ progression , ↑ promotion , ↑ pulse , ↑ rate , ↑ recovery , ↑ reduction , ↑ reform , ↑ repair , ↑ resolution , ↑ response , ↑ retreat , ↑ return , ↑ review , ↑ rise , ↑ shift , ↑ spin , ↑ spread , ↑ stride , ↑ subsidence , ↑ succession , ↑ transformation , ↑ transit , ↑ transition , ↑ turnover , ↑ withdrawal