Hired servant, Hireling - Vine's Expository Dictionary of New Testament Words
Hired servant, Hireling[ 1,,G3411, misthotos ]
an adjective denoting hired," is used as a noun, signifying "one who is hired," "hired servants," Mark 1:20; "hireling," John 10:12-John 10:13; here, it expresses, not only one who has no real interest in his duty (that may or may not be present in its use in Mark 1:20, and in misthios, No. 2), but one who is unfaithful in the discharge of it; that sense attaches always to the word rendered "hireling."
[ 2,,G3407, misthios ]
an adjective, akin to No. 1, and similarly signifying "a hired servant," is used in Luke 15:17, Luke 15:19 (in some texts, Luke 15:21).