full
The company offers a full money-back guarantee.

lifetime, three-year, two-year, etc.
money-back

carry, come with, have
All our products come with a two-year guarantee.

give (sb), offer (sb)

under guarantee (BrE) (under warranty in AmE)
The car is still under guarantee, so you should be able to get it repaired free of charge.

guarantee against
The window frames carry a 20-year guarantee against rot or decay.

guarantee for
The garage gives a year's guarantee for all repair work.

guarantee on
The contractors offer a full money-back guarantee on all their work.

absolute, firm (esp. BrE)
cast-iron (BrE), ironclad (esp. AmE)
long-term
constitutional, federal (esp. AmE), government, legal
The country gives a constitutional guarantee of the rights of minorities.

personal
loan
security

give (sb), offer (sb), provide (sb with)
demand, want
get, receive
We didn't get any firm guarantee of a loan.

violate (esp. AmE)

guarantee against
There was no guarantee against misuse of the political power.

guarantee for
The demonstrators were demanding guarantees for fair elections.

guarantee of
Arriving early is no longer a guarantee of getting a place.

absolutely
I can absolutely guarantee that you will enjoy the show.

personally
I personally guarantee total and immediate support in all measures undertaken.

constitutionally, federally (both esp. AmE)

be able to, can

be fully guaranteed
All our electrical goods are fully guaranteed.

absolutely
almost, practically, virtually
effectively
The complicated electoral system effectively guarantees the president's re-election.

automatically
A degree does not automatically guarantee you a job.

by no means, not necessarily
The outcome is by no means guaranteed.

Guarantee is used with these nouns as the subject:
amendment, constitution, treaty

Guarantee is used with these nouns as the object:
anonymity, confidentiality, delivery, employment, entry, equality, existence, fairness, freedom, future, immunity, impartiality, income, liberty, loan, payment, pension, privacy, profit, representation, return, right, safety, security, service, success