big, enthusiastic, friendly, hearty (esp. AmE), great, rapturous (esp. BrE), rousing, special, tumultuous (esp. BrE), warm
The audience gave the band a rousing welcome.

broad (esp. BrE)
The proposals have been given a broad welcome by green campaigners.

cautious, guarded, qualified (all esp. BrE)
official
hero's
She got a hero's welcome on her return from the Olympics.

get, receive
extend, give sb
outstay, overstay
Sensing that he had outstayed his welcome, he quickly left.

await sb (BrE)
A warm welcome awaits you at this family-run hotel.

in welcome
She held out her arms in welcome.

welcome from
The proposal received a warm welcome from the committee.

welcome to
A big welcome to our special guest, James Greenan.
They received a friendly welcome to their new home.

words of welcome
Thank you for those words of welcome.

be, feel
make sb
They made us very welcome in their home.

very
The 1% rate cut is extremely welcome.

especially, extremely, more than, most, particularly
You would be a most welcome guest.

perfectly, quite
You are perfectly welcome to stay here, if you don't mind the mess.

not entirely
He made it plain that Holman's interest in his business affairs was not entirely welcome.

always
Visitors are always welcome.

to
New members are welcome to the club.

Welcome is used with these nouns:
addition, antidote, bonus, boost, break, change, contrast, departure, development, distraction, diversion, escape, guest, improvement, initiative, innovation, news, opportunity, refuge, release, relief, reminder, reprieve, respite, return, shade, sight, sign, step, touch, trend, visitor