Advanced British English Quiz; Lesson 2; Part 2

Level up your English from basic to intermediate and advanced.
British English Quiz, Lesson 2. Part 2.
Which group does not form a tight synonym cluster?
every now and then, occasionally, sporadically, intermittently
extravagant, beyond moderation, lavish, opulent
compound, combination, enclosed area, intensify
hyperbolically, lofty, proclaim, intrinsic merit

Which group describes “beast”?
trajectory, projected course, direction, vector path
the tip of the iceberg, a fraction of a vast reality, visible part
fierce, untamed, monstrous, formidable
grassroots, primal instincts, epitomizes, archetypal