clay: the soft, wet earth that is shaped by a potter, packed as mortar, or trodden as mire
This is the everyday word for the moist, formless earth that human hands work. The same material shows up in three settings, and English reaches for a different word in each: the potter's clay on the wheel, the wet mortar smeared between mud bricks, and the mire churned up in a street or a pit.
Because it is the stuff a potter molds, this word carries some of the Bible's most vivid pictures of God and people. We are the clay and God is the potter who forms, breaks, and reshapes us (Isaiah 64:8; Jeremiah 18:6). Job returns to it again and again to say that a human being is only handled earth, made from clay and destined to crumble back into it (Job 10:9; Job 33:6).
The building sense is just as ordinary. Israel's slavery in Egypt was spent in mortar and brick (Exodus 1:14), and the same word names the wet clay that seals a wall or a brick kiln (Nahum 3:14). When it is trampled underfoot rather than worked, translators render it mire, the muck of the streets that an army tramples down (Isaiah 10:6).