Hacklers refer to individuals who comb and prepare flax fibres for spinning. There are several synonyms for the word "hacklers" which include flax-combers, hecklers, and linen-makers. Flax-combers specifically denote individuals who use specialized instruments such as hackles to refine and smooth flax fibres. On the other hand, hecklers denote individuals who hackle or comb the flax fibres to remove unwanted material. Linen-makers refer to workers who produce textile materials from flax fibres. Overall, all these terms are used to describe individuals who play a crucial role in the manufacturing of linen products. They typically work in textile factories, linen mills, or as independent craftsmen.