tester meaning
EN
[ˈtɛstə] [-ɛstə(r)] FR tester 
- NounPLtestersSUF-er
- A canopy over a bed.
- Something that overhangs something else; especially a canopy or soundboard over a pulpit.
- A person who administers a test.
- A device used for testing.
- (Australia, slang, obsolete) A punishment of 25 lashes (strokes of a whip) across a person′s back.
- A sample of perfume available in a shop for customers to try before they buy.
- An old French silver coin.
- (Britain, slang, dated) A sixpence.
- A canopy over a bed.
Definition of tester in English Dictionary
- Part-of-Speech Hierarchy
- Morphemes
- Suffixes
- Words by suffix
- Words suffixed with -er
- Words suffixed with -er
- Words by suffix
- Suffixes
- Nouns
- Countable nouns
- Agent nouns
- Countable nouns
- Morphemes
Source: Wiktionary
Grammatically, this word "tester" is a morpheme, more specifically, a suffixe. It's also a noun, more specifically, a countable noun and an agent noun.