Words, coined words, symbols or depictions, (a) which constitute or imply the name or designation of a fiber which is not present in the product, (b) which are phonetically similar to the name or designation of such a fiber, or (c) which are only a slight variation of spelling from the name or designation of such a fiber shall not be used in such a manner as to represent or imply that such fiber is present in the product.
16 C.F.R. §303.18