BALLED BALED BANED BLADE BLAND BLEND LABEL LADEN LADLE NALED ABED ABLE BADE BALD BALE BALL BAND BANE BEAD BEAN BELL BEND BLAE BLED DALE DEAL DEAN DELL ELAN LADE LAND LANE LEAD LEAN LEND NABE ALB ALE ALL AND ANE BAD BAL BAN BED BEL BEN DAB DEL DEN ELL END LAB LAD LEA LED NAB DABBLE NABBED BABEL BALED BANED BLADE BLAND BLEND ELAND LADEN NALED ABBE ABED ABLE BABE BADE BALD BALE BAND BANE BEAD BEAN BEND BLAB BLAE BLEB BLED DALE DEAL DEAN ELAN LADE LAND LANE ENABLED ANELED BALEEN BEADLE BEANED BLENDE ENABLE LEADEN LEANED ABELE ANELE BALED BANED BEDEL BLADE BLAND BLEED BLEND ELAND LADEN LEBEN NALED ABED ABLE ALEE BADE BALD BALE BAND BANE BEAD BEAN BEEN BEND BENE BLAE BLED DALE DEAL

Many words, but theres no point because the first person who answered used an Anagram generator…

You can have:

bend, lend, deal, bane, lane, lean, bean, dean, and, end, lead, led, bed, blend, blended (since you said letters may be used multiple times), leaned, ended, bended, dab, dabbed, nab, nabbed, bad, bade, ade, den, bead, beaded

blend

bland

land

lend

lane

dean

dane

bean

bane

and

add

added

bed

abed

bedded

bell

bend

bended

band

banded

landed

blended

Abe

Abel

Anabelle

able

Anne

Ann

an

Adan

Alan

Abba

ad

and

all

add

Anna

Ada

baa

bee

bell

Ben

bend

blab

bald

bale

ban

bad

been

ball

balled

bed

babble

babbled

bead

beaded

bean

beaned

babe

Babel

ballad

bleed

bled

bane

bland

blend

banana

Bella

Belle

banal

blade

bebe

dad

Dade

deb

Dena

dabble

dabbled

deal

dean

Dane

Della

dead

Dan

Dana

dab

Dell

Dale

dabbed

deed

den

Ellen

el

elan

elle

Ebel

eel

Ed

eden

Ella

Elena

Elba

edd

ebbed

end

ended

eland

enable

lab

land

Lee

lad

label

laden

ladle

ladled

lean

leaned

lead

led

Lana

lane

leaded

Nell

Neal

nabbed

need

needed

Nan

nana

needle

needled