covering vs tray

covering

noun
  • That which covers or conceals; a cover; something spread or laid over or wrapped about another. 

  • Action of the verb to cover. 

  • A continuous map onto a topological space X, 𝜋:E→X, such that there exists a discrete space D and for every x∈X an open neighborhood U⊂X, such that 𝜋⁻¹(U)= displaystyle bigsqcup _(d∈D)V_d and 𝜋|_(V_d):V_d→U is a homeomorphism for every d∈D. 

tray

noun
  • A small, typically rectangular or round, flat, and rigid object upon which things are carried. 

  • A gay trans person, particularly a man (a man who is both transgender and gay) 

  • A type of retail or wholesale packaging for CPUs where the processors are sold in bulk and/or with minimal packaging. 

  • The platform of a truck that supports the load to be hauled. 

  • The items on a full tray. 

  • A notification area used for icons and alerts. 

  • A component of a device into which an item is placed for use in the device's operations. 

verb
  • to slide down a snow-covered hill on a tray from a cafeteria. 

  • to place (items) on a tray 

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