booming, brisk, burgeoning, expanding, flourishing, lively, roaring, thriving
All around the pyramids, salespeople were doing a roaring trade in souvenirs.

increased
lucrative, profitable
cross-border, external, foreign, global, international, overseas, transatlantic, world
domestic, internal, interstate, regional
export, import, import-export
direct, indirect
free, liberalized
fair
The organization promotes fair trade with developing countries.

legal, legitimate
illegal, illicit
attempts to curb the illicit trade in exotic species

private
coastal, maritime
agricultural, commercial
merchandise, retail, wholesale
It has been a bad year for the retail trade.

book, fur, ivory, timber, wildlife, wine, etc.
sex, slave
drug, heroin, opium
tourist
the area's dependence on the tourist trade

evil (esp. BrE)
the evil trade in drugs

conduct, do, engage in, ply
All manner of street sellers were plying their trade.

boost, build up, develop, expand, increase, promote
a bid to boost foreign trade
He built up a trade in seeds, corn and manure.

facilitate
damage, harm
A bitterly cold winter damaged industrial output and trade.

lose
The store has lost a day's trade.

ban, restrict
liberalize
control, govern, regulate
dominate
They already dominated the domestic trade in raw jute.

boom, expand, flourish, grow, increase, pick up
decline, fall

balance, figures, performance, statistics
surplus
deficit, gap, imbalance
adjustment
barrier, blockade, boycott, embargo, restrictions, sanctions
tariff
dispute, war
The countries were locked in a trade war, refusing to allow imports of each other's goods.

liberalization
benefits, concessions
accord, agreement, deal, pact, protocol, treaty
negotiations, talks
cooperation, links, network, relations
partner
agenda, policy, practice
The US was accused of employing unfair trade practices.

law, legislation, regime, rules
bloc
The five countries formed a regional trade bloc.

delegation, mission
Several local companies took part in a trade mission to Spain.

commissioner, minister, negotiator, official, representative
talks between trade officials from the two countries

mark (usually trademark), name
promotion
exhibition, fair, show
centre/center
route
The road has been an important trade route since prehistoric times.

cycle
the boom and slump periods of a trade cycle

association, body, group, organization
the trade body representing water companies

directory
journal, magazine, paper, press, publication
information, secret
The employees were fired for divulging trade secrets to a competitor.

in a/the trade
She's in the wholesale fruit trade.
These flour sacks are known in the trade as ‘pockets’.

trade between
Trade between the Adriatic ports and their hinterland had grown.

trade in
Steps were taken to ban the trade in ivory.

trade with
The US has restricted trade with India.

skilled
building
Work in the building trades became scarce.

learn
carry on, exercise, follow, practise/practice
the tools needed to carry on a trade

by trade
She is a carpenter by trade.

a jack of all trades (= a person who can do many different types of work), the tricks of the trade
The experienced artisan would pass on the tricks of the trade to the apprentice.