IS-IS and OSPF are certainly different animals, but they have enough similarities that it makes sense to put some of the different protocol terms back-to-back.  I stumbled across this list, today:

IS-IS - OSPF

End System - Host
Intermediate System - Router
Circuit - An adjacency on one link
SNPA Address - Data link Address
Protocol Data Unit (PDU) - Packet
Designated Intermediate System (DIS) - Designated Router (DR)
IS to IS Hello PDU (IIH) - Hello Packet
Not Applicable - Backup Designated Router (BDR)
Link State Packet(LSP) - Link State Advertisement (LSA)
Link State Packet - Link State Update
Complete Sequence Number Packet(CSNP) - Database Description packet
Partial Sequence Number Packet(PSNP) - Link state ACK or Request Packet
Routing Domain - AS
Level 2 Subdomain - Backbone Area
Level 1 Area - Non Backbone Area
Level 1/2 IIH PDU - Simple Hello Packet
Level 1/2 LSP - No Distinction
L1L2 router - ABR
System ID - Router ID
Link State Packet ID(LSPID) - Link State ID
Pseudonode LSP - Network LSA

The above was shamlessly reproduced from IS-IS and OSPF Difference Discussions.

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