I have two ... things ... I don't know if this type of phrase has a technical name. my minute newt my migrating grating The first one is minute as in very sm

I have two ... things ... I don't know if this type of phrase has a technical name. my minute newt my migrating grating The first one is minute as in very small. The second one the grating referred to a noun (as in diffraction grating), not a verb.