All categories currently computed in Perl6::Documentable.

categories.txt

basic
composite
domain-specific
core
exceptions
metamodel

variable
v6 (basics)
statement (basics)
block (basics)
zen slice (basics)
term
submethod
trait
classes
method
identifier
declarator
:sym<>
top
<sym>
operator
quote
regex
regex quantifier
regex adverb
matching adverb
substitution adverb
sub
hyper
twigil
syntax
phasers
asynchronous phasers
control flow
lazy (statement prefix)
eager (statement prefix)
quietly (statement prefix)
try (statement prefix)
do (statement prefix)
sink (statement prefix)
once (statement prefix)
gather (statement prefix)
start (statement prefix)
react (statement prefix)
supply (statement prefix)
python
pack
macros
:cached
p6doc
is default (variable)
parameter
constant