The noun 'diffusion' is a concrete noun as a word for the transmission of light through a translucent material; the intermingling of substances by the natural movement of their particles; a word for a physical process.
The noun 'diffusion' is an abstract noun as a word for the spread of linguistic or cultural practices within a community or from one community to another; a word for a concept.
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The noun 'air' is a concrete noun, a word for a physical compound; a word for something that can be measured with instruments.
Basically, motion.
The noun 'crew' is a concrete noun, a word for a physical group of people.
A concrete noun is a word for something that can be experienced by any of the five physical senses; something that can be seen, heard, smelled, tasted, or touched.Examples of concrete nouns are:amberanchoranvilapplearmarmadilloaxlebabybananabasketbeebookbootcabcarcarpetcastlecellistcellocrumbdartdenturesdeskdimedogdoordoughnut, donuteareggeggplantelephantelevatorfacefanfingerfishflagfootfrogfrowngalgirlglassgonggoosegrapeguyhairhandhat
No, the noun wand is a concrete noun; a word for a handheld stick or device; a word for a physical object.