ambitious, audacious, grand, grandiose
The government has ambitious plans for prison reform.

future
long-range (esp. AmE), long-term, three-year, etc.
immediate
What are your immediate plans?

new
original
five-point, three-point, etc.
a three-point action plan to improve hygiene at work

definite, firm (BrE)
A spokeswoman confirmed there was no definite plan to stage a concert in the park.

comprehensive, detailed
good
The best plan is for me to meet you at the airport.

best-laid
Even the best-laid plans can go wrong.

brilliant, clever, cunning, devious, elaborate, fiendish, ingenious
evil
realistic, sound
We need to develop a sound business plan.

controversial
master
backup, contingency
Do you have any contingency plans if there is a delay?

secret
action, battle, game, ground, operational, strategic
What is their game plan for winning the election?

Plan A, Plan B
If Plan A fails, go to Plan B.

business, career, corporate, development
budget, economic, financial, spending
flight, travel
marriage, wedding
treatment
training
expansion, recovery, restructuring
disaster, emergency, escape, evacuation
diet, eating, meal
a six-week low-fat eating plan

birth
peace
war

have
come up with, create, design, develop, devise, draft, draw up, figure out (AmE), form, formulate, hatch, make, prepare, put together, work out
I like to make plans well in advance.

consider, discuss, present, propose, put forward, set out
file (AmE), submit
The airline intends to file a reorganization plan within three months.

adopt, agree, approve
The moves contravene the peace plan agreed by both sides.

finalize, put in place
announce, detail, launch, outline, reveal, unveil
A new plan for reducing traffic accidents was unveiled.

carry out, execute, implement
put in motion, put into action, put into effect, put into operation, set in motion
forge ahead with, go ahead with, move ahead with, press ahead with
follow, keep to, stick to
Let's stick to our original plan

cancel, change, rethink, review, revise
abandon, cancel, drop, reject, scrap, shelve
disrupt, set back
derail, foil, ruin, scupper (BrE), spoil, thwart (BrE)
The strike ruined my travel plans.

support
fight (esp. BrE), oppose
Local residents have vowed to fight plans to build a new road.
Senators signed a letter opposing the plan.

be afoot
Plans are afoot to stage a new opera.

be aimed at sth
The government launched a five-year plan aimed at diversifying the economy.

call for sth, envisage sth (esp. BrE), envision sth (esp. AmE), involve sth
The plan calls for massive investment in the region.

contain sth, include sth
The plan contains four main elements.

come to fruition, succeed, work
fail, fall through, founder, go awry, go wrong

plan for
plans for the future
The president will now press ahead with his plans for reform.

plan to
Plans to build a dam have been shelved following protests.

go to plan
a plan of action, a plan of attack, a plan of campaign
To change anything in this organization, we'll need a plan of action.

pension, retirement
savings
insurance
health, health-care
instalment/installment, payment

set up

street, town
seating
floor, ground, site

draw
file (AmE)
Site plans were filed with the city this week.

show sth
The plan shows the exact location of the house.