How to sign: exchange or give (something) in exchange for
Similiar / Same: swap, swop, switch
Categories: change, exchange, interchange
How to sign: the skilled practice of a practical occupation
"he learned his trade as an apprentice";
Similiar / Same: craft
Categories: business, job, line, line of work, occupation
Within this category: airplane mechanics, auto mechanics, basketry, carpentry, drafting, dressmaking, electrical work, handicraft, interior decoration, lumbering, masonry, mintage, painting, papermaking, piloting, plumbing, pottery, pyrotechnics, roofing, sheet-metal work, shingling, shoemaking, tailoring, tanning, tool-and-die work, typography, undertaking, upholstery, viniculture