Spark calls anything other than a human or "Reclaimer" either a Flood or a Meddler.
Reclaimers are Forerunners who are meant to fire the Halo rings. Because humans are so similar to the Forerunners biologically, the Monitors (i.e. 343 Guilty Spark, 2401 Penitent Tangent) recognize humans as Forerunners. A Reclaimer can be any human and can be recognized by any Monitor, thus proven by Spark referring to nearly every Marine as such and 2401 Penitent Tangent saying "A reclaimer? Here? At last!" to the Master Chief while captured by the Gravemind inside Delta Halo. Elites, to Spark, are just there. They serve absolutely no purpose to him, until the humans and Seperatists united, which he then seemed to recognize the Elites as a means to assist the Reclaimers in the containment of the Flood.