The plural form of odour is odours.

Is smell a plural verb?

The noun smell can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be smell. However, in more specific contexts, the plural form can also be smells e.g. in reference to various types of smells or a collection of smells.

What's the meaning of odors?

1a : a quality of something that stimulates the olfactory organ : scent. b : a sensation resulting from adequate stimulation of the olfactory organ : smell. 2a : a characteristic or predominant quality : flavor the odor of sanctity. b : repute, estimation in bad odor.