Hats, ties, scarves or other such objects which are included in the English of the word have other terms in Japanese. Ame-futo' is a long way from American Football. In many cases, loanwords are only used in combinations. Ice in English refers to a frozen substance. Baransu' in one sense is used in written language, but in another it is colloquial.
Most loanwords are nouns in their original language.
But in Japan they are often used as verbs by adding a Japanese verb ending or verb. Loanwords are frequently blended with Kanji or other loan-words to make a new word. Finally, many former brand names now have taken on a general meaning. These specialized words require a knowledge of the original name in order to mean anything in Japanese. Certainly, many other categories could be added to this outline of special challenges.