INKLE is a 5 letter word that starts with I.

1. \In"kle\, n. [Prob.the same word as lingle, the first l
   being mistaken for the definite article in French. See
   {Lingle}.]
   A kind of tape or braid. --Shak.
   
   

2. \In"kle\, v. t. [OE. inklen to hint; cf. Dan. ymte to
   whisper.]
   To guess. [Prov. Eng.] ``She inkled what it was.'' --R. D.
   Blackmore.