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$ORACLE_HOME/lib/facility.lis

$ORACLE_HOME/lib/facility.lis defines Oracle facilities and corresponding component names.
Each «data line» contains of a colon separated list with the following values:
This file is consumed by ORACLE_HOME/bin/oerr.pl
The following one-liner counts the different component names: 
$ grep -vE '^\s*($|#)' facility.lis | cut -d: -f2  | sort | uniq -c
      1 assistants
      1 browser
      1 crs
      1 css
      1 ctx
      1 cwmlite
      1 evm
      5 forms
      5 forms40
     24 has
      1 install
      1 ldap
      2 md
     44 network
      3 nls
      1 oacore
      2 obackup
     20 office
      1 olap
     10 oracore
      5 ord
      1 pfs
      3 plsql
     22 precomp
      4 qos
      1 racg
     30 rdbms
      1 reports20
     10 rhp
      1 slax
      5 sqlplus
      1 sqlreport
      3 sqltr
     48 srvm
      1 svrmgr
     11 usm
      1 xag
      2 xdk
Some of these components correspond to directories found under $ORACLE_HOME. A variation of the one liner can be used to find components without a corresponding directory: 
$ for f in $(grep -vE '^\s*($|#)' facility.lis | cut -d: -f2  | sort -u); do test ! -d $ORACLE_HOME/$f && echo $f is not a directory ; done

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