Nouns only in singular or plural number

There are nouns that are only, or mainly, used in the singular number.

nouns in the singular number
	Examples
collective nouns	Getreide, Obst, Vieh, Geflügel, Gepäck
abstract nouns	Stolz, Mut, Treue, Gesundheit, Toleranz
nominalized adjectives/infinitives	Böse, Vollendete / Fernsehen, Kochen
nouns that refer to materials	Fleisch, Käse, Gold, Schnee, Tabak
units of measurement (masculine or neuter)	5 Kilo Orangen, 2 Glas Bier, 100 Euro, mit 2 Liter Wasser

And other nouns that are only, or mainly, used in the plural number.

nouns in the plural number
		Examples
collective nouns	people	die Eltern, die Leute, die Gebrüder
collective nouns	other	die Spirituosen, die Möbel, die Lebensmittel
geographical names	countries	die USA, die Niederlande
	mountain ranges	die Alpen, die Anden
	island groups	die Philippinen, die Seychellen
other		die Ferien, die Festspiele, die Kosten