"stimulant" in the noun sense
1. stimulation, stimulus, stimulant, input
any stimulating information or event acts to arouse action
2. stimulant, stimulant drug, excitant
a drug that temporarily quickens some vital process
"stimulant" in the adjective sense
1. stimulant, stimulating
that stimulates
"stimulant phenomena"
Source: WordNet® (An amazing lexical database of English)
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