I’m making a list. Contribute and qualify for the hall of fame.

You put the fist in sophisticated
You put the rapist in therapist
You put the sensual into nonconsensual
You put the hip in rohypnol
You put the colon in colonist
You put the dick in ridiculous
You put the cunt in country
You put the mental in environmental
You put the semen in seminal
You put the man into romance
You put the star into bastard
You put the u in ambulance
You put the sick in sycophant
You put the gin into engineer
You put the tickle into testicle
You put the ace into racist
You put the king into fucking
You put the aaaargh into World Trade Centaaaargh
You put the OK into smoking
You put the kiss into anarchist
You put the eat into meat
You put the ming into Birmingham
You put the ham in Mohammed
You put the sexy in dyslexia
You put the leave into Cleveland
You put the clap into Clapham
You put the whore in horse
You put the flat in flatulance
You put the fun into fundamentalist
You put the big into ambiguous
You put the wank into swanky
You put the STD into stud
You put the poo into poodle
You put the sir into tosser
You put the sin into cousin
You put the fill into necrophilia
You put the us into anus
You put the can in cannibalism
You put the arse in marsupial
You put the come into income
You put the hearse into rehearsal
You put the cut into cutlery
You put the funk into erectile dysfunction
You put the cure in Freddy Mercury
You put the cock into cochlear implant
You put the ordinary into extraordinary
You put the youth in euthanasia
You put the laughter into slaughter
You put the oral in morale
You put the less in endless
You put the fat in fate
You put the shat in shattered
You put the mutation in permutation
You put the hot in shot
You put the lick in slick
You put the cool in school
You put the anal into analysis
You put the port into sport
You put the lure in toddler
You put the shun in coalition
You put the paedo into speedos
You put the ting into Tooting
You put the zing into Kensington
You put the Oh!! into Oval
You put the um into bumming
You put the ho in shoes
You put the boo in booze
You put the edible into incredible
You put the limp in the paralympics
You put the penis in happiness
You put the rot in erotic
You put the hip into hippopotamus
You put the sigh into silence

I’m not including duplicates of any of the words as, for example, you can put the mental into fundamental, governmental etc. and it just gets old.