big, considerable, enormous, great, huge, immense, invaluable, real, substantial, tremendous, valuable
You've been a big help—thanks.
It's a great help having you around.
This plan offers real help to working mothers.

generous
much-needed
direct
The careers officer gives direct help as well as advice.

additional, extra
Is there any extra help for disabled students?

mutual
The system is based on mutual help rather than on payment for services.

voluntary (BrE), volunteer
The homeless shelter relies entirely on volunteer help.

federal, international
immediate
emergency
The organization provides emergency help for refugees.

online
The software comes with excellent online help.

individual
Teachers have little time to give individual help to students.

expert, skilled, specialist (BrE), technical
practical
outside
They can usually manage by themselves, but occasionally need outside help.

domestic, household (esp. AmE), kitchen
financial, legal, medical, professional, psychiatric
When the symptoms persisted, I decided to seek medical help.
Injured dancers should always seek professional help.

get, have, receive
They had substantial help from farmers.

appeal for (esp. BrE), ask for, beg for, call for, request, scream for, seek, send for, shout for, solicit (esp. AmE)
Police are appealing for help in catching the killers.
I opened the window and called for help.

bring, enlist, fetch (BrE), find, get, obtain, recruit, summon
He enlisted the help of a private detective in his search for the truth.
He ran to get help.

could use (AmE), need, require, want
Do you need any help unloading the car?

accept
He's too proud to accept help.

refuse
come to, give sb, offer (sb), provide (sb with)
Passers-by came to the woman's help when she was mugged.

appreciate, welcome
I really appreciate your help.

acknowledge

arrive, come
He lay injured for four hours before help arrived.

be at hand (informal)
Don't panic—help is at hand.

desk, line (usually helpdesk, helpline)
For further information, call our helpline.

menu
The program has a help menu.

beyond help
Some of the injured animals were beyond help and had to be destroyed.

of help
The manual is too technical to be of help to the user.

with help
With a little help, I think I could fix the computer myself.
We broke open the lock with the help of a hammer.

help for
They provide special help for the long-term unemployed.

help from
With help from a parent, a child can do simple cooking.

help in
Local teachers provided invaluable help in developing the material.

help to
She's been a big help to her father.

help with
He'll need help with this homework.

an appeal, a plea, a request, etc. for help
The family's request for help went unanswered.

a cry for help
I heard a cry for help from inside the building.

in need of help
The man was clearly in need of urgent medical help.

an offer of help
He rudely rejected her kind offer of help.