odor (US) or Brit odour 
/ˈoʊdɚ/ noun
plural odors /ˈoʊdɚ/ noun : a particular smell [count] ▪ The cheese has a strong odor. ▪ a fishy odor [noncount] ▪ This deodorant prevents bad odor from occurring. — see also body odor
— odor·less (US) or Brit odour·less /ˈoʊdɚləs/ adjective
▪ a colorless and odorless gas
/ˈoʊdɚləs/ adjective ▪ a colorless and odorless gas
