Splitting hairs. I'm a veterinarian with background in animal science and nutrition. I'm well aware of the differences in digestve physiology between ruminant species, as well as preferences in forages - cattle selectively graze as well, with fescue (particularly high-endophyte KY-31) being one of the last things they'll eat when introduced to a fresh paddock.
Cattle also will browse, if in a wooded setting - there's a very noticeable 'browse line', devoid of leaves/branches up to about 7 feet in the 40 ft strip of woods at the edge of my pastures.
But...cattle lack the proline-rich salivary proteins that allow goats and whitetails - both noted browsers - to eat significant amounts of high-tannin foodstuffs, like acorns, buds, leaves with no ill effects.
If they're walking around nibbling leaves, buds, twigs well-above the ground, it's browsing. If they're putting their heads down and eating grass/forbs growing directly out of the soil, its grazing. Deer do both, hence the efforts we're all going to to provide a mix of desirable forages and mast sources to support and draw them in.
There appears to be division of opinion on suitability of ryegrass for food plots. Some are vehemently opposed to it, but I've used annual ryegrass in my plots for 50 years, with good acceptance and no evidence of invasive properties. YMMV.