Adjectives may be divided into declinable and indeclinable categories. Latvian nouns can be classified as either declinable or indeclinable. Particles are indeclinable&colon; they do not accept suffixes. Although one could assume that "possum" is an indeclinable noun. The indeclinable adjectives end in -i, -a or -s. These indeclinable nouns are not able to receive case morphology. The other two classes are indeclinable. All other cardinal numbers are indeclinable. Most adjectives ending in consonants are indeclinable. Most words ending in are also feminine (and are indeclinable). The rest of the numbers are indeclinable whether used as adjectives or as nouns. In the Greek language the indeclinable word () is used as the currency's name. Indeclinable nouns are nouns which only have one form in all cases (of the singular). Indeclinable adjectives are completely invariable, and can end in either consonants or vowels (except "-o"). The numeral ('one hundred') is indeclinable, but all the other hundred numerals are declinable.