That's fine. You could be spiffy and write it like:
my %class = qw( n Noun v Verb );
my $word = ($class{$part} || "Adjective")->new(...);

Spiffier.

my $word = ({ qw/n Noun v Verb/ }->{$part} || 'Adjective')->new(...);
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I changed my code from that because that doesn't lend itself to repetition. Easier to change one data structure than many lines of code. Although I un-abstracted from what I had originally:

my %class = qw( n Noun v Verb );
my $default = 'Adjective';
...
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