Synonyms of sub

sub 1 of 3

noun (1)

as in submarine

a large sandwich on a long split roll

we shared a tuna sub at lunch

Synonyms & Similar Words

• submarine
• hero
• torpedo
• grinder
• hoagie
• Italian sandwich
• po'boy
• Cuban sandwich

sub

2 of 3

noun (2)

ˈsəb 

as in substitute

a person or thing that takes the place of another

we had a sub in English today, so we didn't get our test results back

Synonyms & Similar Words

• substitute
• replacement
• backup
• surrogate
• assistant
• stand-in
• cover
• reserve
• relief
• proxy
• pinch hitter
• designated hitter
• fill-in
• locum tenens
• alternate
• deputy
• second
• delegate
• factor
• agent
• makeshift
• rep
• representative
• commissary
• apology
• attorney
• assignee
• successor
• stopgap
• procurator
• envoy
• understudy
• reliever
• superseder

sub

3 of 3

verb

as in to substitute

to serve as a replacement usually for a time only

the weekend anchor is subbing for the station's main anchor all this week

she subbed for middle school teachers in the district as needed

Synonyms & Similar Words

• substitute
• spell
• cover
• stand in
• take over
• fill in
• step in
• pinch-hit
• double (as)
• relieve
• understudy

Example Sentences

Recent Examples of sub

Noun

The documents generally span more than 15 pages and over 15 questions, often with extensive sub-parts. —Lauren Feiner, The Verge, 1 June 2026

In 2018, Bruichladdich acquired a replica of the sub, which sits onsite to this day. —Jonah Flicker, Robb Report, 1 June 2026

Verb

First up, thoughts from Rick Woychik, a senior adviser to NIH chief Jay Bhattacharya who subbed for him as keynote speaker, plus some background from our STAT colleague Anil Oza. —Elizabeth Cooney, STAT, 5 June 2026

Players getting subbed off must leave the field within 10 seconds, except for special situations such as ones involving injuries or a security issue. —Tim Reynolds, Chicago Tribune, 2 June 2026