This type of noun is called a noncount noun. Things like milk, air, homework, and luggage are noncount nouns and do not have plural forms. (Click here for a list of more noncount nouns.) Below are some examples of much used with noncount nouns.
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Both these words are uncountable nouns: Do you have a lot of luggage? Two pieces of luggage have gone missing.
Suitcases are the same as luggage, but you cannot say two luggages as luggage is a mass noun. When you travel you have luggage, or two pieces of luggage. Mass nouns use measure words like pieces of to make plurals.
Common nouns are everywhere. Look around you now and you will see many common nouns: door, window, tree, sky, cat, truck, road, computer, phone, bottle, ball, luggage, people, hair.
From Longman Dictionary of Contemporary EnglishRelated topics: Tourism 'hand ?luggage noun [uncountable] the small bags that you carry with you when you are travelling on a planeExamples from the Corpushand luggage• Meg succumbed to the biggest smile she had ever seen in her life and surrendered her case and hand ...