different between resize vs resizer

English

re- +? size

resize (third-person singular simple present resizes, present participle resizing, simple past and past participle resized)

resize (plural resizes)

resize +? -er

resizer (plural resizers)

One who, or that which, resizes.
- 2000, Roderick W. Smith, The multi-boot configuration handbook (page xvii)
  I would also like to thank all the many companies and individuals who have made multi-OS functions not just possible, but usable — the people who produce partition resizers, boot loaders, foreign filesystem drivers, and so on.
- 2014, Alan Snow, Here Be Monsters
  'We have a machine that can shrink things,' Arthur told the lady, whose name was Ms Hawkins. […] 'We need something for them to go behind and it needs a hole in it big enough for the funnel on my resizer.'

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