road
Road Playground School House Garden
no
Either one is fine. But depending on what you're measuring, one of them will give you a convenient number, and the other one will give you an awkward number. Examples: The length of a small paperclip: 30 millimeters, 0.000003 kilometer The length of a major city block: 1,609,344 millimeters, 1.61 kilometers
give three examples in each number system
Examples of nouns are:anarchyanimositybeautybraverycommunismconceptcuriositydemocracydisciplineemotionfeelingfreedomfriendlinessfriendshipfungoalHappinessHatehonestyhonor