We have seen that nouns form an -s plural and adjectives donot: citizen, citizens, but not large, larges. Adjectives differ alsoin that they may be compared, whereas nouns may not: high,higher, highest, but not stone, stoner, stonest. Further, adjectivesare modified by words like extremely, beautifully, somewhat (adverbs)and nouns are not: "an extremely high fence" but not "anextremely stone fence"; "an immaculately clean napkin" but not"an immaculately paper napkin"; "a somewhat large committee"but not "a somewhat citizens committee."In addition, some adjectives indeed, most have endingswhich mark them as adjectives. The more important of theseinclude: