stain

1 stain /ˈsteɪn/ verb
stains; stained; staining
1 stain
/ˈsteɪn/
verb
stains; stained; staining
Britannica Dictionary definition of STAIN
1 
a  : to leave a mark on something
[+ object]
[no object]
b  [no object] : to be marked or damaged by a stain
2 
[+ object] : to use a special liquid to change the color of (something)
3 
[+ object] : to damage or spoil (something, such as someone's reputation)

— stainer

/ˈsteɪnɚ/ noun, plural stainers [count]
2 stain /ˈsteɪn/ noun
plural stains
2 stain
/ˈsteɪn/
noun
plural stains
Britannica Dictionary definition of STAIN
[count]
1 
: a mark made on a surface, a piece of clothing, etc., that is very hard or impossible to remove
— see also bloodstain
2 
: a special liquid that is used to change the color of something (such as wood or cloth)
3 
: something that causes people to have less respect for someone : something that damages a person's reputation — usually singular

— stainless

/ˈsteɪnləs/ adjective