acreyoudaoicibaDictYouDict
acre: [OE] Acre is a word of ancient ancestry, going back probably to the Indo-European base *ag-, source of words such as agent and act. This base had a range of meanings covering ‘do’ and ‘drive’, and it is possible that the notion of driving contributed to the concept of driving animals on to land for pasture. However that may be, it gave rise to a group of words in Indo- European languages, including Latin ager (whence English agriculture), Greek agros, Sanskrit ájras, and a hypothetical Germanic *akraz.

By this time, people’s agricultural activities had moved on from herding animals in open country to tilling the soil in enclosed areas, and all of this group of words meant specifically ‘field’. From the Germanic form developed Old English æcer, which as early as 1000 AD had come to be used for referring to a particular measured area of agricultural land (as much as a pair of oxen could plough in one day).
=> act, agent, agriculture, eyrie, onager, peregrine, pilgrim
herd (v.)youdaoicibaDictYouDict
mid-13c., “to watch over or herd (livestock);” of animals, “to gather in a herd, to form a flock,” late 14c., from herd (n.). Related: Herded; herding.
ranch (n.)youdaoicibaDictYouDict
1808, "country house," from American Spanish rancho "small farm, group of farm huts," from Spanish rancho "mess-room," originally, "group of people who eat together," from ranchear "to lodge or station," from Old French ranger "install in position," from rang "row, line" (see rank (n.)).

Sense of "large stock-farm and herding establishment" is from 1831. Of houses, "single-story, split-level" (adj.) from 1950; as a noun from 1960. Ranch-house attested from 1862.
shepherd (v.)youdaoicibaDictYouDict
1790, "to herd sheep," from shepherd (n.). The metaphoric sense of "watch over or guide" is first recorded 1820. Related: Shepherded; shepherding.