Here is a list of nouns that start with STI.
stick, stickler, stickman, stickpin, stiff
stiffening, stigma, stigmata, stiletto, still
stimulant, stimulation, stimuli, sting, stink
stint, stipulation, stirring, stirrup, stitch
Hope you enjoy this page of nouns that start with sti and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.