The word game!!

tree

flower

bouquet

Several (flowers)

Quantity

quality

.
qualification
.

disqualification

USA

(4x100m :smash:)

Canada

Bailiwick of Jersey

Channel

Television

box

.
buttocks
.

rear

Animal

(As in animal rearing)

husbandry (or husband-householder)

wife

marriage

poverty :help:

Aid

Help.

doctor

doctorate

course

directorate (bearing as in НКВД and ОГПУ)

.
mice

CIA slang for MI5 in the series Spooks

.

cat

Kibble (edit: the name of my cat+what cats eat...)