(informal) those guys, a group, bunch of people

practice, train, drill / polish, gloss / refine

an alchemist (one who practices alchemy)

alchemy (ancient chemistry) / (figuratively) a way that can make money without work

a federal state; a federation

practice (learning or improvement of a skill)

practice

connection, junction / keeping in contact; correspondence / communication, correspondence

association of ideas

The act of following in sequence; succession. / A sequence of things arranged in order; succession.