Boom

Bumm

(sound of explosion)

Aufschwung

(period of prosperity)

Ausleger

(horizontal member of a crane)

Baum

(spar extending the foot of a sail)

Boom

(rapid expansion or increase)

Boom

(period of prosperity)

Dröhnen

(abrupt, low-pitched sound)

blühen

(to be prosperous)

boomen

(to be prosperous)

dröhnen

(to speak with low pitch)

florieren

(to be prosperous)