elongation, prolongation, lengthiness, reference, denotation, annex, annexe, propagation, university extension, wing, more...

contraction, reduction, shortening, compression, decrease

.com, .net, .org, .info, .biz, .us, .ws, .cc, .tv, .name, more...

further, logical, natural, direct, full, agricultural, simple, rapid, possible, gradual, wider

building addition,   building out,   building annex,   building add-on,   period in a url,   pc file suffix,   table leaves,   # after a phone #,   phone no. add-on,   by extention