sextant vs sixth

sextant

noun
  • One sixth of a circle or disc; a sector with an angle of 60°. 

  • A navigational device for deriving angular distances between objects so as to determine latitude and longitude. 

  • One of six groups of adjacent teeth, excluding the wisdom teeth. The front sextants go from canine to canine, and there are sextants on the right and left of these. See w:Periodontal examination. 

sixth

noun
  • One of six equal parts of a whole. 

  • The interval between one note and another, five notes higher in the scale, for example C to A, a major sixth, or C to A flat, a minor sixth. (Note that the interval covers six notes counting inclusively, for example C-D-E-F-G-A.) 

  • The person or thing in the sixth position. 

verb
  • to divide by six, which also means multiplying a denominator by six 

adj
  • The ordinal form of the number six. 

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