threefold vs triply

threefold

adv

  • by a factor of three 

verb

  • To make threefold; to triple. 

noun

  • An algebraic variety of dimension 3. 

adj

  • triple 

  • three times as great 

triply

adv

  • At three times the severity or degree. 

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