ladder vs series

ladder

noun
  • A series of stages by which one progresses to a better position. 

  • A length of unravelled fabric in a knitted garment, especially in nylon stockings; a run. 

  • A frame, usually portable, of wood, metal, or rope, used for ascent and descent, consisting of two side pieces to which are fastened rungs (cross strips or rounds acting as steps). 

  • In the game of go, a sequence of moves following a zigzag pattern and ultimately leading to the capture of the attacked stones. 

  • The hierarchy or ranking system within an organization, such as the corporate ladder. 

verb
  • Of a knitted garment: to develop a ladder as a result of a broken thread. 

  • To ascend (a building, a wall, etc.) using a ladder. 

  • To arrange or form into a shape of a ladder. 

  • To close in on a target with successive salvos, increasing or decreasing the shot range as necessary. 

series

noun
  • A number of things that follow on one after the other or are connected one after the other. 

  • A set of consonants that share a particular phonetic or phonological feature. 

  • A television or radio program which consists of several episodes that are broadcast in regular intervals 

  • An unranked taxon. 

  • A parcel of rough diamonds of assorted qualities. 

  • The sequence of partial sums ∑ᵢ₌₁ⁿa_i of a given sequence aᵢ. 

  • A subdivision of a genus, a taxonomic rank below that of section (and subsection) but above that of species. 

  • A group of matches between two sides, with the aim being to win more matches than the opposition. 

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