bug|defect|fault
web site|website|web page
abstraction|abstracting
api|application programming interface
test|testing
location|localization|locality|localisation|locality
application|app
tracking|tracker
triaging|triage
development|developmant
bug fix|fixing bug|bug fixing
java project|java system|java application
c project|c system|c application
android project|android system|android application
mozilla project|mozilla system|mozilla application
open source project|open source system|open source application
open source|opensource
stackoverflow|overflow
software|system
topic modeling|topic model
co change|co changing