The Collaborative International Dictionary of English v.0.48:

Humbles \Hum"bles\, n. pl. [See Nombles.]
   Entrails of a deer. [Written also umbles.] --Johnson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Umbles \Um"bles\, n. pl. [See Nombles.]
   The entrails and coarser parts of a deer; hence, sometimes,
   entrails, in general. [Written also humbles.] --Johnson.
   [1913 Webster]