What is a slicer? I can't think when I'd ever use that word in English
Høvel, ostehøvel, barberhøvel, veihøvel
Planer, cheese slicer, razor, scraper
Høvel is usually the kind used to plane wooden surfaces (something for the carpenter), but in context it could mean the other ones as well
slicer, noun: a thin-bladed knife or implement used for slicing, especially food.
I think those are also called mandolin slicers in some places.