I'm trying to get the words that only differ from one character. but i'm stuck in almostmatch method. can you help me?

I'm trying to get the words that only differ from one character.

but i'm stuck in almostmatch method. can you help me?

word.txt

band

bent

bike

boat

card

cash

cast

coat

cold

cord

core

cost

dame

dash

dear

deck

deer

deme

dime

dine

dinn

dish

dive

dome

door

dorm

face

fake

fast

find

fine

finn

fire

fish

fold

folk

fore

hard

hash

hear

held

help

here

hire

hold

host

knot

kunn

kuns

lake

land

lase

last

lice

like

lime

line

linn

live

lost

love

lunn

main

make

mash

maze

meta

mice

mien

mike

milk

mind

mine

mink

more

most

must

nash

neck

nice

nick

nine

nuns

pain

pine

pond

pony

poor

pour

rain

rash

rick

rime

rust

sake

sand

sane

sick

silk

sine

sony

sure

tiny

vice

vide

ward

warm

worm