Any helper in the audience? Eager to know a good

Any helper in the audience? Eager to know a good synomym of spur. Cheers!

‘Spur’ as in noun or verb? The verb form of ‘spur’ means: urge (say, a horse) forward by digging one’s spurs into its sides.
The noun form of ‘spur’ means: a device with a small spike or spiked wheel that is worn on a rider’s heel and used for urging a horse forward. The noun form has these synonyms - stimulus, incentive, encouragement, stimulant, inducement, impetus, prod, prompt.

Since “spur” is not mentioned in the text I assume you mean “spar”. That’s difficult because in this case “spar” is a technical term:
“A stout pole such as those used for masts, etc.; a mast, yard, boom, gaff, or the like.”

Just to add to @Deahna’s info: spar is also

a. a mineral and
b. a verb “to spar” = making attacking and defending movements (seen in box sports where a “sparring partner” helps you train).