Why does neither of these return 'blade'?

my @letters = qw(b a l d y a e y t);

__PASTE__ 

~/perl_stuff> grep blade /usr/dict/words 
blade
switchblade

~/perl_stuff> perl golf.pl 
aye
baldy
bay
bayed
beady
bey
by
bye
byte
day
delay
dey
dye
lady
lay
lye
y
ye
yea
yet

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<a href="http://www.graq.co.uk">Graq</a>

In reply to Re(3): "Countdown" (golf) by graq
in thread "Countdown" (golf) by stuffy

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