abacus vs laptop

abacus

noun
  • A device used for performing arithmetical calculations; (rare) a table on which loose counters are placed, or (more commonly) an instrument with beads sliding on rods, or counters in grooves, with one row of beads or counters representing units, the next tens, etc. 

  • The uppermost portion of the capital of a column immediately under the architrave, in some cases a flat oblong or square slab, in others more decorated. 

  • A board, tray, or table, divided into perforated compartments for holding bottles, cups, or the like; a kind of buffet, cupboard, or sideboard. 

laptop

noun
  • A laptop computer. 

How often have the words abacus and laptop occurred in a corpus of books? (source: Google Ngram Viewer )