What's the difference between creaser and greaser?

Creaser

Definition:

(n.) A tool, or a sewing-machine attachment, for making lines or creases on leather or cloth, as guides to sew by.
(n.) A tool for making creases or beads, as in sheet iron, or for rounding small tubes.
(n.) A tool for making the band impression distinct on the back.

Example Sentences:

(1) This mutant can utilize L-histidinol as sole source of carbon and nitrogen and has a 60-fold increased histidinol dehydrogenase (HDH) content (Dhawale, Creaser & Loper, 1972).

Definition:

(n.) One who, or that which, greases; specifically, a person employed to lubricate the working parts of machinery, engines, carriages, etc.
(n.) A nickname sometimes applied in contempt to a Mexican of the lowest type.

Example Sentences:

(1) Although the crystal structure of troponin C is known (Herzberg, O., and James, M. N. G. (1985) Nature 313, 653-659; Sundaralingam, M., Bergstrom, R., Strasburg, G., Rao, S. T., Roychowdhury, P., Greaser, M., and Wang, B. C. (1985) Science 227, 945-948), its structure in solution, particularly under physiological conditions, has not been established.
(2) Partial extraction of troponin C (TnC) decreases the Ca2+ sensitivity of tension development in mammalian skinned muscle fibers (Moss, R. L., G. G. Giulian, and M. L. Greaser.
(3) The amino acid sequence deduced from this clone matches the previously reported amino acid sequence (Collins, J. H., Greaser, M. L., Potter, J. D., and Horn, M. J.