pulse vs rhythm

pulse

noun
  • The beat or tactus of a piece of music or verse; also, a repeated sequence of such beats. 

  • Edible grains or seeds from leguminous plants, especially in a mature, dry condition; (countable) a specific kind of such a grain or seed. 

  • The nature or rate of this beat as an indication of a person's health. 

  • The focus of energy or vigour of an activity, place, or thing; also, the feeling of bustle, busyness, or energy in a place; the heartbeat. 

  • An (increased) amount of a substance (such as a drug or an isotopic label) given over a short time. 

  • A setting on a food processor which causes it to work in a series of short bursts rather than continuously, in order to break up ingredients without liquidizing them; also, a use of this setting. 

  • A brief burst of electromagnetic energy, such as light, radio waves, etc. 

  • A normally regular beat felt when arteries near the skin (for example, at the neck or wrist) are depressed, caused by the heart pumping blood through them. 

  • A beat or throb; also, a repeated sequence of such beats or throbs. 

  • A brief increase in the strength of an electrical signal; an impulse. 

  • Synonym of autosoliton (“a stable solitary localized structure that arises in nonlinear spatially extended dissipative systems due to mechanisms of self-organization”) 

  • Annual leguminous plants (such as beans, lentils, and peas) yielding grains or seeds used as food for humans or animals; (countable) such a plant; a legume. 

verb
  • To give to (something, especially a cell culture) an (increased) amount of a substance, such as a drug or an isotopic label, over a short time. 

  • To manipulate (an electric current, electromagnetic wave, etc.) so that it is emitted in pulses. 

  • Of an activity, place, or thing: to bustle with energy and liveliness; to pulsate. 

  • To emit or impel (something) in pulses or waves. 

  • To apply an electric current or signal that varies in strength to (something). 

  • To expand and contract repeatedly, like an artery when blood is flowing though it, or the heart; to beat, to throb, to vibrate, to pulsate. 

  • To operate a food processor on (some ingredient) in short bursts, to break it up without liquidizing it. 

rhythm

noun
  • The tempo or speed of a beat, song or repetitive event. 

  • A specifically defined pattern of such variation. 

  • A regular quantitative change in a variable (notably natural) process. 

  • Controlled repetition of a phrase, incident or other element as a stylistic figure in literature and other narrative arts; the effect it creates. 

  • The variation of strong and weak elements (such as duration, accent) of sounds, notably in speech or music, over time; a beat or meter. 

  • A flow, repetition or regularity. 

  • The musical instruments which provide rhythm (mainly; not or less melody) in a musical ensemble. 

  • A person's natural feeling for rhythm. 

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