something that produces an effect, that makes something happen

agent, originator

to be in a state of (social or political or personal) excitement or trouble; (to cause a substance) to change chemically through the action of organic bodies (especially yeast) that change glucose into alcohol, e.g. in beer, wine

substance causing chemicals to split into simpler substances

to fill, inspire a person with a mentioned feeling etc

infuse, saturate

(to cause a material or substance) to be filled with another

infuse, fill; make pregnant

to fill a person with (a quality, energy etc)

introduce; soak